Chuck



Sept 6, 1932- w. L. TRUMPHOUR ET AL 1,875,959

CHUCK 7 'Sheets-Sheet -1 Filed Jan. 2. 192,9

Sept. 6, 1932.

W. L. TRUMPHQUR ET AL CHUCK` Filed Jan.- 2. 1929 7 sheets-sheet 2 Sept6, 1932- w. 1 TRUMPHOUR E1' AL 1,875,959

CHUCK Filed Jan. 2, 1923 Sheets-Sheet 5 Sepf- 6, 1932 l w. L. TRUMPHOURE'r AL 1,875,959

CHUCK Filed Jan. 2, 1929 7 sheets-sheetV e i Sept. 6, 1932. w. L.TRUMPHOUR E1' AL 1,875,959

vQHUCK Filed Jan. 2.' 1929 7 sheets-sheet 7 'l Patented Sept. 6, 1932 AUni-ran STATES .PATENT orrlcl;

WILLIAM L.' raumrnou, or' CLEVELAND, i AND MAX LANaE,V or CLEVELANDHEIGHTS.' CHIC, AssrCNoRs 'ro THE WARNER a swAsEY COMPANY, or CLEVELAND,

OHIO, A CORPORATION OF OHIO This invention relates to work holdingchucks Jfor machine tools and has for its chief object to provide achuck which is providedl with work holding means so supported relativeto the chuck body that the work piece can be moved 'to differentpositions so as to centralize dierent portions to be machined.

A further object is to accomplish this result with a trunnioned' workholder which can be turned to dierent positions and effectively securedtherein.

v Still further, the invention aims to provide a construction whereinthe positioning of different parts of the work to be machined can beaccomplished by a lateral'movement o one part relative to another,aswell as by a rotary movement of the part which immediately supportsthe work piece.

A further object is to provide a simple but eiiective means fordeinitely locatingthe relatively movable parts in the different workingpositions and for clamping them in position so/that the work piece willbe accurately' positioned duringV the machining operations. v

The above and other objects are attained by this invention which may bebriefly sumvmarized as consisting in certain novel combinations andarrangements of parts and details of construction which will bedescribed in the speciiication and set "forth in the ap-E4 .pendedclaims. Y 1

In the accompanying sheetsof drawings,

stantially along the line 6-6 of Fig. 1, showl ing the dovetail of theadapter in elevation;

Fig. 7 is a sectional view substantially along the line'7-7 of Fig. 6;Fig. 8 is aside view of the rotatable work supporting member or CHUCKAppueatim mea January 2, 1929'. serial- N0.j329,7oo.

cradle removed from' the chuck body; Fig. 9 is a perspective view of oneof two clamping bars forming a part of: the cradle, the clamping barsbeing omitted from. Fig. 8; Fig. 10 is a fragmentary view, partly insection, the section being taken substantially along the line 10-10 ofFig. 4 with a cover plate removed; Fig. 1l is a fragmentary sectionalview, the 'section being taken substantially along the line ll-llof Fig.5; Fig. 12

is a top plan view of the work holding cradle with the clamping barsremoved; Figs. 13 and 14 are side views of the chuck, similar to Fig. 1,with portions inseetion and the parts shown on a reduced scale, thesetwo views showing the relatively movable parts of the chuck in differentpositions for machining view similar toFig. 2 with parts in section,showing a different work support substituted for the cradle of Fig. 2for the purpose of supporting a work piece companion to the work piecewhich is'supported in the cradle of Fig. 2; Fig. 16 is a viewcorresponding to Fig. 10, but showing the work holding means of Fig.

different parts of the work piece; Fig. 15 is a 15, the work piece beinghere shown in ele- I vation, the view here shown being an interior viewwith the partsA viewed substantiallyvfrom the line 16-16of Fig. 15; andFig. 17 is a 4fragmentary sectional view substantially along the line17-17 of Fig. 15.

Our improved chuck in this instance includes a so-called adapter 20 anda chuck body' 21 which is carried thereby. The adapter has Va threadedportion 20a, see particularly Fig. -7, adapted to be screwed onto a"rotating work spindle of 'a lathe or other machine tool. The chuck body21 is movable on the adapter laterally of the axis of rotation of thechuck, and, accordingly, they have a dovetailed sliding connectionconsisting in .this instance of a dovetail projection 207 .on-the faceof the adapter engaging in a dovetail slot on the adjacent facev ofthechuck body (see Figs. 3 and 6). It will be noted by reference to Figs. 6and 7' that the ,rear portion of the chuck body has 'a pair ofoppositely` disposed lugs 21? and 21h which project intorecesses formedin thedovetail face of the adapter,

60 1 two abutments meet` to definitely locate the the lug 2lbbeing,-removable and being secured lin position by screwsor the like for 1 andof providing means whereby it may be moved laterally on the adapter is,with the cooperation of a rotatable work holder tobe explained, toenable different portions of the .work piece to loe-centered formachining purposes. lith a work piece such as illustratedherein and tobe later described, it is desirable that the chuck'liody have threedefinite working positions on the adapter, one being a center positionand the other two ByV turning this screw, the

cate the chuck body in these positionsl is illustrated.

The chuck body is substantially U-shapcd i in that it has -a backportion which engages the adapter and two forwardly projecting armsdesignated generally by the reference characters 2l? and 21d, the innerfaces of these arms forming substantially parallel surfaces toaccommodate the rotatable or swivelled work holder and the outer sides'or faces being preferably curved to conform to the curvshaped inasmuchas it has a base portionbridging the space between the inner faces ofthearms and two parallel sides 29 and 29b l being at equal distances onopposite sides of/ which are parallel and close tothe inner faces Y thecenter position. ,f

It is desirable also thatV the chuck body be definitely located orpositioned in'its several working positions, andlocating means of aneffective nature are incorporated in the chuck. To definitely locate thechuck body in its central position on the adapter,

we prefer to employ a `lock bolt 23 whicli of the arms of the workholder. The swivelling or journaling of the work holding cradle in thearms of the chuck body is accomplished by means of two trunnions 30 and31. The `trunnion 30 is secured to the side 29a of the cradle, the innerend being flanged and being both fitted and secured in a suitable recessin Ithe side 29a to form a rigid connection with is carried by theadapter (note Figs. 1, 3 and\the cradle, the mainpart of thistrunnionmember projecting into a trunnion socket in 6), and is adapted atitsiinner end to engage a bushing 23a carried by the chuck body.Provision is made for withdrawing the lock bolt, consisting in thisinstance of a small l lever 24 capable of being swung in adjacentrecessed portions 25 of the adapter and the chuck body l(seeparticularly 3), this lever being mounted on the outer end of arotatable bolt retractor 26 having a suitable cam portion adapted toengage -a pin on the lock bolt to retract itv from the bushing 23a.

As usual, a spring behind the lock bolt will cause'it to snap into thebushing 23aA when released by the retractor. l

To locate the chuck body in its/two 'offcenter working positions onopposite sides of its hcenter position', we have provided in thisinstance adjustable abutments in the form of screws 27 which are mountedin the lugs 21i and 21b of the chuck body and are adapted to engagecompanion abutments in this l. instance in the form of pins 28 carriedby the adapter,v as best illustrated in Fig. 6.

When it is desired toshift the chuck body laterally in either directionfrom central polsition ,-the lock bolt 23 is withdrawnby swinging thelever 24, and then the screw 22 is turned in one direction or the otheruntil the chuck body in one ef the two predetermined off-centerpositions. The two off-center positionsare clearly illustrated in Figs.`13 and 14, and the fune-tion of the abutments to lotlie arm 21. A stemprojects from the outer end of this trunnion and a nut 32 is screwedonto the stem'so that the side 29a of the cradle can be drawn up closeto the adj acent' side of the arm 2lc of the, chuck body into engagementwith one race of an annular thrust bearhas a relatively large flange 31afitting into.

a recess formed on the inner side of the arm 21d, the periphery of thisflange being tapered'- for a purpose Vto be described. `The fiange '31ais bolted to the side 29b of the cradle to rigidly connect them togetherand the two parts are centered before being bolted'together by acentering pin 34 having a fianged inner portion fitted into -a recess onthe inner surface of the side-29b of the cradle jecting through theAside 29"` into the trunnion` member 31. Secured to the outer end 'ofthe 'bearing portion of the trunnion member 31 is adisk 35` held inplace by screws which, when tightened, draw the iange 31a of thetrunnion member 31A against the inner race of an annular. thrust bearing36 mount-` and proi ed in a recess in the arm 21d of the chuck body.

With. this construction and mounting, thel -cradle 1s effectivelysupported .by its trunnions for rotary movement and can be turnedfreely, the ball bearings taking the lateral thrust on the sides of thecradle in either direction when the work piece supported iny the cradleis being machined, and at the same time allowing free movement of thecradle while it is being turned from one working position to another.

.cradle has at least five working positions and with slight variationsin the nature of the work piece it may have more or less than fiveworking positions, but the work piece herein illustrated, which will bedescribed presently, and the five working po'sitionsto be referred towill suiice to illustrate the principle and the details of construction,as well as the function of the chuck.

We have'found it desirable, where work of great accuracy is required,that/the cradle 'be deinitely located in its several working positionsand that it be clamped in each working position against accidentalmovement therefrom. Accordingly, we provide between the cradle and thearms of the chuck body position locating and clamping means which willnow be described. Y To definitely locate the cradle'of the work holderin its several working positions, we provide aseries of lock bolts, inthis instance three lock bolts, designated 37, 38 and 39,

, which are arranged adjacent each other 'in the arm 21c of the chuckbody (see particularly Figs. 1 and 5) in an arc of a circle concentricvwith the axis ofthe trunnion 30.

, With these lock bolts there is employed a series' of bushings 40, 41,42, 43, 44, 45 and 46, these bushings being supported by the side' S29aofthe cradle and being arranged in'an arc of a circle concentric withthe axis of the trinnion 30. It may be here stated that the bushings 41to 45 are utilized in centrallzing five portions of the work pieceherein and 39.

In this instance, all three lock bolts 37, 38

`and 39 are adapted to be controlled, i. e.,

withdrawn, by a single bolt retractor 47 whicli is mountedl in the ,arm21 of the work holder ,(see`F' 5). This bolt retractor has an angularlys aped cam portion (see Fig.

11) adapted to engage pins on the-loc`k bolts..

The retractor47, which is rotatably mounted, has attached to one endthereof a lever 48 arranged on thevside of the arm 21c of theworkfholder, this lever being normally held between a Xed pin 49 and aspring actuated ,or depressible pin 50, these pins normally Y holdingthe .lever in a position such thatthe lock bolts are free to engage inthe bushings. When the lever is swung from its normal position shown inFigs. 3, 4 and 5, all three vlock bolts will' be simultaneouslyretracted and when swung back to its normal position, they are againmoved inwardly by the springs associated therewith and the one which isintended to function will snap into the appropriate bushing.

Under certain circumstances or when certain work pieces are beingmachined, the two outer lock bolts 38 and. 39 are unnecessary, and insuch cases it may be desirable to retain them in inoperative positionout of the Control of the retractor 47 and of the springswhich normallyactuate them inwardly.- ln order that this may be done, these two lockbolts 38- and 39 are provided with axially disposed screws 51 which passthrough spring retaining plugsv4 arranged in `the lock bolt sockets andare screwed axially into the lock bolts. By screwing thesescrewsinwardly, the lock bolts'canbe withdrawn and held in withdrawn position.

In order that the cradle may be clamped after being located by one ofthe lock bolts 37, 38 or 39 inf' any one of the several workingpositions, we provide in the arm 21d of the work holder a taperedarc-shaped clamp 52 which lies between the tapered side of the flange31a of the trunnion member 31 and an oppositely tapered face ofthe-recess of the arm 21d which receives the flange (see Figs. 4 and10). This clamp is adapted to be pulled outwardly so' as to tightlyfrictionally engage and, therefore, lock the flange of the trunnionmember 31 ,and therefore the cn tire cradle by means of screws 53, threesuch screws being shown by dotted lines in Fig. v 11o-- 10,`which screwsare threaded inthe clamp 52 and extend. outwardly to the outer side ofthe arm 21d of the work holder. Obviously, with this construction, whenthe screws are loosened the clamp is released andthe cradle may berotated, and'when the screws are tightened, it is tightly clampedagainst movement in the position in which vit has been located by one ofthe lock bolts. The recess on` the inner side of the arm'21d o-f thework holder which receives the clamp 52 is preferably closed by a coverplate 54 removably held in place by screws or the like to exclude dirt,dust and the like from the working surfaces of the clamp and .the twoparts whichthe clamp engages. This' cover plate is indicated, in sectionin Fig. 4 and is also indicated in Fig. 2 but is removed' from Fig.r 10to show the clamp.

' The chuck herein described, though by no means limited in its use toreceivi gand holding work pieces such as herein illustrated anddescribed, does have especial utility in supporting gate valve bodiesand for that reason a work piece of this particular vtype is illustratedand will be briefly dc,-

vscribed in connection with the work holding nieansutilized to clamp thework in the work holder and also to make clear the purpose of valve bodyis designated asa whole by the reference character 55. As is usual withthe different working positions of the chuck body von the adapterand thedifferent working positions of the work holder in the chuck body. Thework piece,'in the form of a gate bodies'for valves of this type,tliisvalve body has a through passageway terminating in'4 two oppositelydisposed flanges 55a and 55b and a neck at right angles to the throughpassageway terminating in a flange 55c which `aux ' work on the valvegate itself which, in F igs.v l5 and 16, is designated 56. In machiningis adapted to receive the valve cap through which the valve gate stemextends. Additionally, the valve body is provided with two inclinedvalve seat portions 55d and 55e which vare adapted to receive valveseats designed to be engaged by the opposite tapered sid-es of the gateorv Inova le valve member proper,

, these seats being secured in place in the seat portions-which are tobe machined by facing, boring and threading. The valve body has betweenthe seat portions 55d and 55e guides for the valve gate, the guidesbeing usually in the form of slots 551.

'It might be here-stated that with a modification in the work holderthis chuck may be utilized for doing all the necessary machine thisgate, the work vholder is adapted to be positioned so as to face the end56"L and to bore the end at 56b to receive the stem, and

also `to machine the opposite tapered sides 56c and 56d `to receiverenewable faces which are adapted to engage the valve seats mounted inthe body, as explained.'

The valve body 55 is placed in the cradle 29 when the latter is in theposition illustrated in Figs. l, 2, 4: and 5, the valve bodyv being then'simply lowered .down into thercradle from the top. When the valvebodyis.

thus lowered into the cradle, it rests upon a series of supportingscrews 57, two pairs 'of these screws being utilized. These screwsextend diagonally` up through the bottom por-` tion of the cradle andupwardly through ribs 58 which are arranged at both ends ofthe cradleand project inwardly from the bottom and sides. The outline of theseribs indicated in Fig. 4 will-showthat they extend ribs 58 are providedwith screws'59 which i are adapted to engage the inner faces of theflanges 55a and 55b so as to locate and hold the valve body againstendwise movement, these screws engaging the flanges on substantially thecenter plane ofthe fixture,- as illustreated in Fig. 4. Additionally,the upper or free ends of the sides of the cradle have inwardly'projecting screws 60 which engage opposite sides' of the neck-of thevalve body and thus hold it against rotary movement in the cradle. Thevalve body is now held against movement in all directions except aniupward movement .and to hold it against movement in this direction, weemploy two clamping bars 61 which extend across or bridge the sides ofthe cradle, these two bars `having intermediate their ends clampingportions/"6la'which engage the valve bodies just inwardly of the flanges55 and 55 and in fact directly opposite the lower supporting screws 57,thus forming in effect a threepoint contact for each end of the valvebody.

lThe ends of these clampingbars are slotted,

as shown at- 61h, tol receive Iclamping bolts. Preferably one end ofeach bar engages under the head of an adjustable T-bolt 62, and theopposite end of the bar is clamped down by a swinging bolt 63, the boltsof course engaging in the slotted ends' of the bars, as illustratedparticularly in Figs. 2 and 3, and the sides of the chuck body and ofthe cradle being s o formed that these hinge bolts can be swungoutwardly to disengage the bars and inwardlyto engage them. It will beobserved that the cradle with these clam-ping bars 6l and the workholding screws constitutes the' complete swivelled or rotatablev workholder and that whenthe work piece is placed in the. cradle and securedin place in the manner described it is held rigidly in the cradleagainst movement in any direction.

. When the valve body has been placed in i the chuck and secured inposition as' explained, the machining can be started. Generally theflanges 55a,- 55b and 55C are successively machined, this yincludingfacing,

' boring and turning operations. When these portions ofthe valve bodyare being machined, the chuck body occupies itscentral -position withrespect to the adapter, being then held in that position by L.means ofthe lock bolt 23. Furthermore, the machining of these portions ofthe'valve body requires 4 that the work holder or cradle be located andclamped in three of its different .working positions 90 apart. When inthes'eworkingpositions, the cradle is in each instance located (prior tobeing clamped in position)by the central lock bolt 37 which for thesethree positions engages the three bushings 41, 43 and 45, which, as will.be seen by reference to When it is desired tomachine the valve seatportions 55d and 55e which portions are inclined with respect to eachother and with respect to thev axis of the valve body, it is necessarynotonly to turn the cradle to two additional Working positions to bringeither portion 55d or 55 in' a position at right angles to the axisofsthe work vspindle ofthe machine tool, but it also requires a movementof the chuck body on the adapter to bring it to one or the other of itsoH-center workingpositions in order to center the boreof the portion 55dor 55e with reference to the work spindle. To thus move the chuck body,the lock bolt 23 is first withdrawn and then the screw 22 is actuateduntil the proper pair of abutments 27 and' 28 engage, one pair of yabutments engaging for one oilcenter position utilized'in machining oneof the two portions 55d 'and 55, and the other pair of abutments'engaging when the chuck body is moved to its opposite off-center workingposition when the other of these portions of the valve body is to bemachined.

When the cradle is rocked to bring the portion 55d in a plane at rightangles to the axis of the work spindle, the lock bolt 3 9 now functionsto locate the cradle in the proper position by yengaging the bushing 42,and

when the chuck body has been moved to the necessary off-center positionso as to centralize the portion to be bored with reference to the axisof the work spindle, the parts will be in the relative positions shownin Fig. 13, the upperA abutments 27 and 28 then engaging.

When it is desired to machine the portion 55e, the cradle must be turnedsubstantially 180 from the position which it occupies in A'portions Fig.13, -in whichl event the lock bolt 38 now functions to locate thisworking position of the cradle by snapping into the bushing 44. When thechuck body has been 'moved to the opposite oi-center position withrespectto the adapter, the parts will occupy the relative ositions shownin Fig. 14.

With the above described operations and positioning, the five bushings41, 42, 43, 44 and 45 are.utilized. The bushing 40, which isdiametrically oppositebushing 44, and the bushing 46, whichisdiametrically opposite bushing42, will be utilized in a slightmodification of the valve body which requires machining on the rearsides of the seat d and 55, in which event4 the machining on the rearside of the seat portion 55d is best vaccomplished `by turning thecradle and valve body 180"v from the osition shown in Fig. 13, and themachin- 1n on the rear portion of the seat portion 55" is estaccomplished by turning the cradle and valve body 180 from the positionshown inFig.'14.

When all thesemachining operations are being accomplished, the toolholding bar is extended into the valve body and it is .braced duringthese machining operations by means cfapilot 64 which is arrangedcentrally in' the adapter as vshown in Figs. 2, 4

i The adapter and chuck body of the chuck will be the same as previouslydescribed, but the U-shapedl work holder '29 is replaced with aVtwo-part Work holder, the two partsbeing trunnioned as before in thearms of the chuck body, and when the work is clamped therein, become aunit vwhich may turn as one which may be rotated and clamped in positionlike the Workv holder previously described. One part of this work holderconsists of a disk 65 having a trunnion .66 which may in this instancebe integral with the disk' and similar in all respects to the trunnion30 of the previously described construction. The disk is drawn'intoengagement with the inner race of the same ball bearing 33l used in theconstruction first described.' On the inner face of the disk 65 is aclampin rail 67 carrying a clamp 68 secured to the rail by clampingscrews 69.

The other part of the Work holder consists of a disk 70 which is securedto the disk 31a iece of the trunnion 31 of the firstdescribedconstruction. The clamp 52 functionsl with this chuck assembly preciselyas previously described. On the inner face of the disk 7 0 is a clampingrail 71 carrying a clamp 72 se-- cured to the former by clamping screws73.

The workpiece, consisting in this instance of the gate 56, is rovided onits opposite edges with guide ribs 56" which are adapted to slide in theguide slots 55l of the valve body, and when the gate is placed in thistwo-part 110 work holder it bridges the space between them and theseguide ribs are then tightly clamped between the clamping rails andclamps, thus creating, as previously stated, a rigid unitary structurewhich is rotated, positioned and clamped as if formed of one piece.

The machine work'to be done on this gate requires the work holder to' bedefinitely 1o- '.cated in three positions. The locating of the workholder in these positions is accom-4 plished byv means of the centerlock bolt 37, the other two lock bolts 38 and 39 then being preferablyheld in their retracted positions y"the screws 51 previously described.This lock bolt cooperates with three bushings 74, 7 5 land 76 which arecarried on the inner face of the disk- 65'. In `case -the angularity' ofthe sides v56" andi56 varies, it may be desirable to adjustablysupportthe bushings, and in Fig. 17 we have shownlthe threebushings carried byplates 74, '75 and 7 6".

. chuck with a trunnioned Work holder in thei -form of av cradle adaptedto accommodate having faces inclined relatively at different angles, butit facilitates the assembly, in so farv as the proper locating of thebushings is concerned.

While We have shown the preferred construction With one modication inthe Work holder, We'do not desire to be confined to the precise detailsshown but aim to cover suchmodiications as do not involve a departurefrom the spirit and scope of the invention.

Furthermore though We have described the a Work piece consisting of aparticular form of valve body, and have described thel trunnionedtwo-part Work holder of Figs. 15 to 17 as being adapted to accommodatethe gate of said. valve body, We Wish it understood that both types ofWork holders may be einployed in connection With other kinds of Workpieces. Furthermore, it might be stated that though We have illustratedremovable and relatively adjustable lock bolt bushings. in connectionwith the modified -Work holder of Figs. 15 to 17, similar features ofreinovability and adjustability may be applied to the U-shaped Workholder shown in vthe preceding figures of the drawings.

Having thus described our invention, we claim:

-1. A chuck comprising a chuck body, a Work holder in the form of theunit rotatably supported bythe chuck body, locating means forpositioning the work holder in predetermined, positions, and taperedmeans for clamping the Work holder in such positions.

2. A chuck ,comprising a chuck body, a trunnionedwork 'holder carriedthereby, land a Wedge ring arranged concentric with the axis of rotationto secure the Work holder in different. positions.

.3. A chuck comprising a chuck body, a

-Work holder rotatably supported therein,

means for locating the Work holder in definite positions, and a Wedgering arranged concentric -With the axis of rotation to clamp the Workholder in such positions. 4.'A chuck having a member-movable todifl'erent'angular positions, a plurality of de- A vices for holdingsaid member in its different positions, and a single controlling meansfor said devices. v

5 A chuck comprising a supporting mem# ber, a chuck body slidablymounted thereon laterally of the axis of the chuck body, means vformoving said chuck body laterally froma central Working position to otherworking positions, and separate holding means for positioning the chuckbody in each of said p ositions.

6. A chuck comprising a supporting member, a chuck slidably mountedthereon laterally of the axis of the chuckv body, means for moving saidchuck body laterally from a central `Working position to other Workingpositions, and locating means for position1 ingthe chuck body in saidpositions, said locating means including members adapted to abut toposition the chuck body in one orA more working positions laterally ofits central position.

7. A chuck comprising a chuck body with soi two spaced Walls, a Work'holder having trunnions with bearings in said Walls, and a clampindependent of said bearings for holding the Work holderin differentpositie-iis and arranged to engage one of said trunnions.

8. A chuck comprising a chuck body with two spaced Walls, a work holderhaving trunnions with bearings in said Walls,.and a clamp independentofsaid bearings extending about one of said trunnions and adapted toengage the same.

9. A chuck comprising a chuck body, and

a substantially U-shaped Work holder rotatably'supported therein andhaving adjustable work engaging members mounted in the base and sidesthereof to support the work piece against movement in a plurality ofplanes.

10. Achuck comprising a chuck body, and

a substantially U-shaped Work holder rotatably supported therein andhaving adjustable work engaging members mounted inthe base and sidesthereof and lhaving Work engaging means extending between the sides tosupport l the work piece against movement in a plurality of planes.

11. A chuck comprising a chuck body having a Work holder with bearingsin the chuck body to permit it to rotate therein and provided withanannular clamping surface, and a clamp engageable with said surface forholding the Work holder in different Working positions.

12. A chuck comprising a chuck body having a Work holder with bearingsin the chuckl body to permit it to rotate thereinv and pro-` vided Withan annular clamping portion, and

la tapered clamping member adapted to engage said surface.

13. A chuck comprising a chuck body having a Work holder with bearingsin the chuck body to permit it torotate therein, the Work holder andchuck body having oppositely disposed clamping surfaces, and aWedge-shaped clamp adapted to engage said surfaces.

14. A chuck comprising a chuck body, a i

Work holder supported thereby 4and having bearings in the chuck body topermitl it to rotate therein, and afriction clamp for enl gaging thework holder independent of sai'd bearings to hold it in dierent Working,positions.

15. A chuck comprising a chuck body, `a work holder rotatably supportedthereby, a lock bolt engageable with the Work holder,

and a friction clampalso engageable with the the top, bottom and ends ofthe Work piece for adjusting the same in vertical,l horizontal andangular planes and for holdingthe same against movement in anydirection.

In testimony whereof, We hereunto aflix our signatures. VILLIAM L.TRUMPHOUR.

MAX E. LANGE. i

